Electric switch



May 31. 1927.

G. F. `SCOTT ELECTRIC SWITCH Filed Dec. 1920 ffv l//l/lA INVENTORV zg/ F560# S E S S E N H W Patented' May 31,1921.

'1.630.359 FICE,

GUY r. scornor wmx'msnune, PENNSYLVANIA, AssIGNon To wEsrINGHoUsE ELECTRIC a n'ANUrAc'rUnmeconrANY, AconronA'rIoN or PENNSYLVANIA.

" V"iirlacrrac swrrca.

'l y 'Appuc'aadi ala necesitar' 7, i920. j senaiNp. 428,862.7

My invention relam to switches and ticularly to s uchpush-button control switches as are employed tointermittentIyopen and 'y fboth ofthe openings 8 and 9, in the usual close an electric circuit orto contro1 relays s andlike apparatus, through-an auxiliary circuit. y .f-

' The object ,o f my -inventon'fis to provide a switchjof the characterdescribed which shall possess the advantages Tof simplicity,- eili- 1o ciency .of operation and .cheapness.

' Another object is'to provide a44 switch the parts of which shall be readily accessible for eplacements and repairs without removing -1t from its support.

. 15- Another-.object ofmy inventionlis'to'provide a 'bridgingv member and a contacttiptherefor ofsuch-'form that the tip may. be

firmly secured to the ibridging/-memberfwit'hu e employment ofany securingmeans,` 5;-1'20 such as rivets.

"".outt

Still another v'object is to priividel switch left-""jwith a push button that shall have a 4yield- 1ng connection' tothe 'bridging member, in

^ order that'=each'f .o f-said parts may have a 2'6 small amoun i movement independently ,of the other.

My invention -1s pnying drawingswhereimf f' Figure l1 is "a ywiw, partially in sidetelva- 3 0 tion and-partiallyin section, of one form'o Y sviritzh towhich my invention maybe' ap, Pe; J. Fig. 2 is a similarview of another-form of switch embodyngmy invention; 35' .Fig. '3jis1 afse'ctional detail vie'awof the push-bnttoninember of the-switch; Figspi aus, sectional'yiew" respectively, of. a bridging member,"andwi. -v

.14o Fig. 6 1s a 'f view, 'end elevation, of the` switch box. i v The s witc1i .parts are' monnt'edinja box I which composed oa member comprising i bQttOmTfifandintegral ends 27am! 28 and 1.3" 46 .a member-'comprising a cover Tand integral' sides 29 and' 30:5. The'bottol' 6 has upwardly vprojecting sideedges. 31 and32 toprevent j i' spreadingofthe's'ides 29 and 30 oftl1emem4 ber 7 and also, 'has a'pairof lugs' 33jan'dt4 50, to'whichthe cover -is attached bylmeans of "bolts or screws'. .Openings 8. and. 9 are provided in the respectivle .ends of. the box.`

'- A switch base'10 is located onthe'bottom v 6 of the box and has a 'terminallmember 11 55. andliastationarycontact member 12`(F1g..1)v

'ber 12,' In the construction shownin Fig. 2, the brldging member is normally in engageillustrated accom-v manner,' and the clrcuit may be completed 60 .across 'the contactmembers by means of a movable Contact or bridging member 13 which is mounted on the base 10 and is conlnected to the'terminal member 11.

The bridging member 13 is actuated by a push-button' 14, and, in the construction shown in Fig. 1 itis normally out of engagement with the'staticnary contact memment with-a stationary contact member 15 and, consequently, lthel circuit normally closed. l l

In practice, 'these switches are usually mounted in pairs, the push 'button of the 75 .switch of Fig. 1 being'provided with a col' .ored -disk16 (Fi 3) andthe push 'button' of the switch of ig. 2 being provided'with a disk of a different color. It is customary toA provide a white disk for .the ush button which is used toset the contro edmechanism inmotion and to provide a red disk for the push button which is used to bring such mechanism Ato a stop. However, these are mere details, as either switch may be used alone 1n a variety of ways', such, for

. example, as for operatmgmechanism inter,i

nuttently or for controlling' an auxiliaryv I circuit'which actuates a relay to control a main circuit.

As shown in lFig. 3,'the push button is made ofmolded material, such as. bakelite,

and is provided'with a. shouldered body' portion 17.V A recess is formed in. theito of tlie button, in which one-of the'colored fsk? above"refe'rred to may-be secured. .A

A stem 19 is molded' in thebod'y portion 17 and projects througha'hole 20 in the bridging kmember 13.- Theend of the stem.. -19 is upset, as indicated at 21,-'to' prevent the withdrawal through the 'hole '20 but. permits' 'relative movement of the Vstelnfand the brid -ing member 13. A-compr'ess'ionspring 244s' placed'V bet. -een the push buttonfand 'the bridging-member'- 13 to take A'nuthin' lost- 1105 motion betweensuch 'lneinliers by normally' maintaining theA ush buttondn .its outermost; position wit .respect to' the bridging -member.' -Y 5 rTh'e purpose ofthe lostfmotion'connection 110 just described 4ist'o normally maintain the push button in engagement with'the under side of the cover plate 7 and'thus exclude moisture and dirt from the switch box and provide a reasonable amount ofplay between ber 13 will not be held out of engagementv with the stationarycontact member 15', as would happen if the push button 14 were rigidly secured'to the bridging member and the cover plate 7 became dented or otherwise so deformedas to prevent complete outward movement ofthe push button.

' The sides29 and 30 of the box are formed integrally with the cover, in order.that, when thecover is removed, the switch parts may be accessibleffor repairs and for the connection of wires which may be passed through ythe holes 8 and 9 of the ends.

' It-will be observed that the stationary contact members and their terminals are angularly disposed -on the base in order that, in case a. plurality o f boxes are mounted close to one another,`the terminal screws ma be reached 'by a screw driver from a point W ere an'adjacent boxfr the ends 27 and 28 will not interfere. v

The bridging member 13 isprovided with another hole 22 adjacent to its free end, and a tip 23 of soft metal, such as copper, is

folded over suchend and pressed tightlythereon, as 'shown in Fig. 5, to cause some of the metal to flow intothe opening 22 and maintain the tip 23 securely in position without the necessity of using rivets.

Inasmuch as the bridging member-l3 is composed of relatively hard flexible `material, suchv as phosphor bronze, .it is desirable to have a contact tip formed on the en d thereof of material which is a better conductor.

Utilization of the switches in'pairs is not necessary inorder to secure the operations accomplished by the Y 'devices of Figs. 1 and 2. For example, thesbridgingmember may be utilized* to close' a circuit at each extremity of its movement. i

Various other'modiiications may be made in the construction Withoutdeparting from Y the spirit of the invention, as defined in the accompanying claims.

- I claim as my invention :-v v 1. In an electric switch, a switch box, -a cover therefor provided with'an opening, a push button extending through the 4opening and having a shouldered portion normally in engagement with the under side of the cover,

to a stationary terminal member' and its other endadapted to engage a. stationary 4contactmember, a stem extending loosely through the bridging member and having an expanded endto normally abut against the under side of said member and its other end rigidly seated in the push button, and an ex.

other end adapted to engage a stationary Contact fember, av stem extending' through,

`and slidable vertically in, the bridging member and having an expanded end to normally engage theunder side of the bridging meinber and having its othel end molded in the push button, and means for normally holding the push button-in' extended position with respect to the bridging member. i

3. In an electric switch, astationary contact member, a movable contactmember having one end thereof adapted for movement into and out of engagement with the stationary contact member, said movable contact meina bridging member having one end connected vbridging member having one end connected to a stationary terminal member and the ber having a perforation adjacent to said A end, and a contact tip folded over the-end of the movable [contact member and compressed tightly thereon to enter the said perforation. 4. In anelectric switch, a stationary contact member, a movable contact member mounted for movement into and out of engagement therewith' and having a perforaloo tion,and a contact tip of relatively soft material folded over the said perforation in such mannerfthat compression thereof' will cause metal to flow therefrom into the perforation to form a rivet-like holding member for the'tip.

`In vtestimony whereof, I have hereunto subscribed 'my name vthis 30th day of November' 

